This battery operated air freshner goes where other units don't and provides more freshening power for a larger room. With an adjustable scent release timer, you choose 9, 18 and 36 minutes between sprays. The intermitant sprays renew the scent in the room. If you want a bit more freshening, just press the green X-press button on the front. There is a little green light that flashes when it is about to release scent or when teh batteries or fragrance are running out. Each kit comes with the plastic housing, 2 AA batteries and a scent canister. It is easy to assemble, just insert the batteries and the canister, then set the timer for the desired interval. Scent canisters last up to 60 days. The unit must be used in the upright postion or the canister will leak. Even though the fragrance is a liquid, it comes out powder dry leaving no residue or wet splotches. The biggest thing I don't like about it is it looks like something on the wall in a public restroom. If the housing was another color or had a different design, I'd think this is just perfect. This unit costs a bit more than some of the others but it is well worth it. We have a pleasant scent through our entire living room and even some of the kitchen The plug in air freshners couldn't do that, not even 3-4 in the same room.